<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 默认头像区域 -->
            <div class="avatar-box">
                <img src="../assets/logo.png" alt/>
            </div>
            <!-- 表单区域 -->
            <el-form
                    label-width="0"
                    class="formLogin"
                    :model="loginForm"
                    :rules="loginFormRules"
                    ref="loginFormRef"
            >
                <el-form-item prop="username">
                    <el-input prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
                </el-form-item>
                <el-form-item class="btns">
                    <el-button type="primary" @click="login('loginFormRef')">提交1111111111111111</el-button>
                    <el-button type="info" @click="resetForm('loginFormRef')">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                loginForm: {
                    username: 'admin',
                    password: '123456',
                },
                // form验证规则
                loginFormRules: {
                    username: [
                        {required: true, message: '请输入用户名', trigger: 'blur'},
                        {min: 3, max: 10, message: '用户名长度为3-10位', trigger: 'blur'},
                    ],
                    password: [
                        {required: true, message: '请输入密码', trigger: 'blur'},
                        {min: 6, max: 10, message: '密码长度为3-10位', trigger: 'blur'},
                    ],
                },
            }
        },
        methods: {
            // 重置表单
            resetForm(formName) {
                this.$refs[formName].resetFields()
            },
            //登录
            login(formName) {
                //获取在登录之前的预验证,使用了async和await来简化返回的promise对象，
                //再利用解构赋值将返回值中的data赋给res
                this.$refs[formName].validate(async (valid) => {
                    if (!valid) return
                    const {data: res} = await this.$http.post('/login', this.loginForm)
                    if (res.meta.status !== 200) return this.$message.error('登陆失败')
                    this.$message.success('登陆成功')
                    //1.登陆成功后，取出返回的token存入sessionStorage
                    // 1.1 项目中除了登录之外的接口，均需要在登陆之后才能访问
                    // 1.2 token存在sessionStorage中只在当前网站打开时生效
                    window.sessionStorage.setItem('token', res.data.token)
                    //2.通过编程式导航跳转到后台主页，路由地址：/home
                    this.$router.push('/home')
                })
            },
        },
    }
</script>

<style lang='less' scoped>
    .login_container {
        background-color: #2b4b6b;
        height: 100%;
        position: relative;
    }

    .login_box {
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
    }

    .avatar-box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;

        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

    .btns {
        display: flex;
        justify-content: flex-end;
    }

    .formLogin {
        width: 100%;
        padding: 0 20px;
        position: absolute;
        bottom: 0;
        box-sizing: border-box;
    }
</style>
